Messi and Ronaldo are still icons of world football. Although now their performance is declining in each of the teams they defend. But his appearance is still awaited by most football lovers. Moreover, this is a World Cup where these two players have never lifted the trophy of the biggest party in football. Not only that, disputes between two fans still occur, especially on social media, both fans are still comparing who is better between the two even though there are now many talented young players born.
It is surprising to hear that their performance is declining. Personally, I haven't noticed any such thing. Messi has scored frequently for his new club (Paris Saint-Germain), while Cristiano Ronaldo is in good form for Manchester United. And recently both the players have helped the national teams in various tournaments. That said, I would not make a comparison between these two players. Both of them have their own unique set of skills. In some domain, one will be better than the other and the reverse may be true in some of the other domains.